From 541a3f09ecb062e3f0778eb9846732cfabcbfbba Mon Sep 17 00:00:00 2001
From: Paul Kocialkowski <contact@paulk.fr>
Date: Tue, 11 Aug 2015 11:22:54 +0200
Subject: [PATCH 7/7] vboot: Display callbacks for developer and recovery mode
 screens

We don't want to use bitmaps stored in GBB since they recommend the use of non-
free software (Chrome OS), so this implements a text-based interface instead.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
---
 src/vboot/callbacks/display.c | 168 +++++++++++++++++++++++++++++++++++++++---
 1 file changed, 156 insertions(+), 12 deletions(-)

diff --git a/src/vboot/callbacks/display.c b/src/vboot/callbacks/display.c
index efa0691..b659f7b 100644
--- a/src/vboot/callbacks/display.c
+++ b/src/vboot/callbacks/display.c
@@ -84,9 +84,17 @@ void print_on_center(const char *msg)
 	print_string(msg);
 }
 
-VbError_t VbExDisplayScreen(uint32_t screen_type)
+VbError_t VbExDisplayScreen(uint32_t screen_type, VbNvContext *vnc)
 {
-	const char *msg = NULL;
+	unsigned int rows, cols;
+	uint32_t boot_signed_only = 0;
+	uint32_t boot_usb = 0;
+	uint32_t boot_legacy = 0;
+	const char *fw_id;
+	int fw_index;
+	void *blob = NULL;
+	int size = 0;
+	char *msg;
 
 	/*
 	 * Show the debug messages for development. It is a backup method
@@ -98,31 +106,167 @@ VbError_t VbExDisplayScreen(uint32_t screen_type)
 		video_console_clear();
 		break;
 	case VB_SCREEN_DEVELOPER_WARNING:
-		msg = "developer mode warning";
+		video_console_clear();
+		video_console_set_cursor(0, 0);
+
+		if (vnc != NULL) {
+			VbNvGet(vnc, VBNV_DEV_BOOT_SIGNED_ONLY,
+				&boot_signed_only);
+
+			VbNvGet(vnc, VBNV_DEV_BOOT_USB, &boot_usb);
+			VbNvGet(vnc, VBNV_DEV_BOOT_LEGACY, &boot_legacy);
+		}
+
+		print_string(
+			"Welcome to developer mode!\n\n"
+			"Useful key combinations:\n"
+			"- Ctrl + H: Hold developer mode\n"
+			"- Ctrl + D: Boot from internal storage\n");
+
+		if (boot_usb)
+			print_string("- Ctrl + U: Boot from external media\n");
+
+		if (boot_legacy)
+			print_string("- Ctrl + L: Boot from legacy payload\n");
+
+		print_string(
+			"- Ctrl + I: Show device information\n"
+			"- Space: Disable developer mode\n\n"
+			"This screen is shown for 3 seconds (if not held)."
+			"\n\n");
+
+		if (vnc != NULL) {
+			if (!boot_signed_only)
+				print_string(
+					"Warning: this device will boot kernels"
+					" without verifying their signature!"
+					"\n");
+
+			if (boot_usb)
+				print_string(
+					"Warning: this device will boot from "
+					"external media!\n");
+
+			if (boot_legacy)
+				print_string(
+					"Warning: this device will boot legacy "
+					"payloads!\n");
+
+			if (!boot_signed_only || boot_usb)
+				print_string("\n");
+		}
+
+		find_common_params(&blob, &size);
+
+		if (blob != NULL) {
+			VbSharedDataHeader *vdat = (VbSharedDataHeader *) blob;
+			fw_index = get_active_fw_index(vdat);
+			fw_id = get_fw_id(fw_index);
+
+			if (fw_id == NULL)
+				fw_id = "NOT FOUND";
+
+			print_string("Active firmware id: ");
+			print_string(fw_id);
+
+			switch (fw_index) {
+				case VDAT_RW_A:
+					print_string(" (RW A)\n");
+					break;
+				case VDAT_RW_B:
+					print_string(" (RW A)\n");
+					break;
+				case VDAT_RO:
+					print_string(" (RO)\n");
+					break;
+				default:
+					print_string(" (UNKNOWN)\n");
+					break;
+			}
+		}
 		break;
 	case VB_SCREEN_DEVELOPER_EGG:
-		msg = "easter egg";
+		video_console_clear();
+		print_on_center("Free as in Freedom!");
 		break;
 	case VB_SCREEN_RECOVERY_REMOVE:
-		msg = "remove inserted devices";
+		video_console_clear();
+		print_on_center(
+			"Please remove any external media before accessing "
+			"recovery screen.");
 		break;
 	case VB_SCREEN_RECOVERY_INSERT:
-		msg = "insert recovery image";
-		break;
 	case VB_SCREEN_RECOVERY_NO_GOOD:
-		msg = "insert image invalid";
+		video_console_clear();
+		print_string(
+			"Welcome to recovery mode!\n\n"
+			"Useful key combinations:\n"
+			"- Ctrl + D: Enable developer mode (if possible)\n\n");
+
+		if (screen_type == VB_SCREEN_RECOVERY_NO_GOOD)
+			print_on_center(
+				"Invalid recovery media, please instert a "
+				"valid one.");
+		else
+			print_on_center(
+				"Please insert an external recovery media.");
+		break;
+	case VB_SCREEN_RECOVERY_TO_DEV:
+		video_console_clear();
+		video_get_rows_cols(&rows, &cols);
+
+		video_console_set_cursor(0, 0);
+
+		print_string(
+			"Enabling developer mode will allow booting unsigned "
+			"kernels and booting from external media (when enabled "
+			"with crossystem).\n\n"
+			"Developer mode can be disabled via the developer mode "
+			"screen.");
+
+		msg = "Developer mode will be enabled.";
+		video_console_set_cursor((cols - strlen(msg)) / 2, rows / 2);
+		print_string(msg);
+
+		msg = "Press enter to confirm or escape to go back.";
+		video_console_set_cursor((cols - strlen(msg)) / 2,
+					 rows / 2 + 2);
+		print_string(msg);
+		break;
+	case VB_SCREEN_DEVELOPER_TO_NORM:
+		video_console_clear();
+		video_get_rows_cols(&rows, &cols);
+
+		video_console_set_cursor(0, 0);
+
+		print_string(
+			"Disabling developer mode will restrict boot to signed "
+			"kernels stored on internal memory only.\n\n"
+			"Developer mode can be enabled again via the recovery "
+			"mode screen.");
+
+		msg = "Developer mode will be disabled.";
+		video_console_set_cursor((cols - strlen(msg)) / 2, rows / 2);
+		print_string(msg);
+
+		msg = "Press enter to confirm or escape to go back.";
+		video_console_set_cursor((cols - strlen(msg)) / 2,
+					 rows / 2 + 2);
+		print_string(msg);
 		break;
 	case VB_SCREEN_WAIT:
-		msg = "wait for ec update";
+		video_console_clear();
+		print_on_center("Waiting for EC update...");
+		break;
+	case VB_SCREEN_TO_NORM_CONFIRMED:
+		video_console_clear();
+		print_on_center("Disabling developer mode.");
 		break;
 	default:
 		printf("Not a valid screen type: %d.\n", screen_type);
 		return VBERROR_INVALID_SCREEN_INDEX;
 	}
 
-	if (msg)
-		print_on_center(msg);
-
 	return VBERROR_SUCCESS;
 }
 
-- 
1.9.1

